Silver Cove

Silver Cove is a cave that can be accessed by using HM3 Surf on Rosecove Beach. Despite being a cave there aren't any Pokemon encounters. The cave is grassy and rocky and it has some blue crystals around. In the end of the cave there is a circular waterfall that ends on a lake.

Pedestal
In the end of the cave there is a stone path that end to a staircase. If you climb the stairs you will find a blue and white star pedestal. The purpose of this is unknown but it is most likely about a Legndary or Mythical Pokemon encouter.